package com.hmdp.service.impl;

import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONUtil;
import com.hmdp.dto.Result;
import com.hmdp.entity.ShopType;
import com.hmdp.mapper.ShopTypeMapper;
import com.hmdp.service.IShopTypeService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;

import java.util.List;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.CACHE_SHOP_TYPE_KEY;
import static com.hmdp.utils.RedisConstants.CACHE_SHOP_TYPE_TTL;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class ShopTypeServiceImpl extends ServiceImpl<ShopTypeMapper, ShopType> implements IShopTypeService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    /**
     * 查询商铺类型
     * @return
     */
    @Override
    public Result queryList() {
        String key = CACHE_SHOP_TYPE_KEY;
        // 查询redis缓存是否存在数据
        String shopTypeJson = stringRedisTemplate.opsForValue().get(key);
        if (StrUtil.isNotBlank(shopTypeJson)) {
            // 缓存中存在数据，返回
            List<ShopType> shopTypes = JSONUtil.toList(shopTypeJson, ShopType.class);
            return Result.ok(shopTypes);
        }
        // 缓存中不存在数据，查询数据库 select * from shop_type sort by sort
        List<ShopType> shopTypes = query().orderByAsc("sort").list();
        // 添加入缓存
        stringRedisTemplate.opsForValue().set(key, JSONUtil.toJsonStr(shopTypes), CACHE_SHOP_TYPE_TTL, TimeUnit.HOURS);

        return Result.ok(shopTypes);

    }
}
